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Fair Value Measurements - Additional Information (Detail) |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2014 USD ($) | Feb. 28, 2014 EUR (€) | Feb. 28, 2014 Unsecured Senior Notes | Feb. 28, 2014 Fair Value, Measurements, Recurring Cross-currency swap USD ($) | May 31, 2013 Fair Value, Measurements, Recurring Cross-currency swap USD ($) | Feb. 28, 2014 Fair Value, Measurements, Recurring Foreign currency forward contract USD ($) | May 31, 2013 Fair Value, Measurements, Recurring Foreign currency forward contract USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Foreign currency contracts, fair value of liability |  |  |  | $ 21,099,000 | $ 10,048,000 |  | $ 4,751,000
Debt, interest rate |  |  | 6.70% |  |  |  |
Debt, due date |  |  | Nov. 01, 2015 |  |  |  |
Effective euro fixed-rate borrowing | 5.31% | 5.31% |  |  |  |  |
Notional principal amount of cross-currency swap | 150,000,000 | 125,000,000 |  |  |  |  |
Foreign currency forward contract |  |  |  |  |  | $ 3,816,000 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + References No definition available. + Details
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